last modified

2014-05-27

nickname

supermarket

institution

cmu

reason for most recent change

the initial version

release date

2014-05-27

date/time of measurement start

2011-02-15

date/time of measurement end

2011-03-01

website

www.crawdad.org/cmu/supermarket

network type

802.15 WPAN (wireless personal area networks)

collection environment

The data is collected in the New Wing Yuan supermarket in Sunnyvale, CA, USA (1139 N Lawrence Expy Sunnyvale, CA 94089) during working hours. 30 anchor nodes are deployed over the supermarket. Volunteer students equipped with a mobile sensor node measure the RToF values from the anchors at 1589 distinct locations in the aisles and perimeter of the supermarket.

An illustration of the layout, product placements, placement of sensor nodes and point of measurements is included in README.pdf.

network configuration

The network consists of 30 deployed anchor nodes equipped with 802.15.4a Nanotron nanoLoc transceivers. A mobile node also equipped with a 802.15.4a Nanotron nanoLoc transceiver attempts to obtain RToF measurement from all anchors in a single-hop network configuration.

data collection methodology

The network consists of 30 deployed anchor nodes (15 at a time) equipped with 802.15.4a Nanotron nanoLoc transceivers.

The supermarket is split into two parts and 15 nodes are deployed at a time. A mobile node also equipped with a 802.15.4a Nanotron nanoLoc transceiver polls all 15 deployed anchors on command, over an interval of 30 seconds, waiting 1 second to obtain an RToF measurement from each anchor. 3 retries are attempted in every 1-second slot.

The mobile node is attached to a stick and mounted at height of 1.5m from the ground to maintain a constant vertical position. The orientation of the node is always held constant facing the north wall of the supermarket.

In addition, a magnetometer reading is recorded at each location.

20 sets of readings are recorded at each location.

The RToF and magnetometer measurements are logged as a text file on a workstation attached to the mobile node with timestamps.

sanitization

Every unavailable reading (due to anchors being out of range or localized network disruption) is replaced with a NaN (not-a-number).

Relative co-ordinates are assigned to every location on the supermarket floor where measurements are made.

limitation

The data at each location is obtained over a period of 20 minutes, covering the entire supermarket area over a period of 15 days. As readings are not obtained simultaneously, the methodology incorporated diurnal variations in measurements.

• Aveek Purohit
  apurohit@ece.cmu.edu
  
• Shijia Pan
  shijia.pan@sv.cmu.edu
  
• Kaifei Chen
  zheng.sun@sv.cmu.edu
  
• Zheng Sun
  pei.zhang@sv.cmu.edu
  
• Pei Zhang
  

When writing a paper that uses CRAWDAD datasets, we would appreciate it if you could cite both the authors of the dataset and CRAWDAD itself, and identify the exact dataset using the appropriate version number. For this dataset, this citation would look like:

Aveek Purohit, Shijia Pan, Kaifei Chen, Zheng Sun, Pei Zhang, CRAWDAD dataset cmu/supermarket (v. 2014‑05‑27), downloaded from https://crawdad.org/cmu/supermarket/20140527, https://doi.org/10.15783/C7MW2Z, May 2014.

• Cite using BibTeX
• Cite using RIS

@misc{cmu-supermarket-20140527,
    author = {Aveek Purohit and Shijia Pan and Kaifei Chen and Zheng Sun and Pei Zhang},
    title = {{CRAWDAD} dataset cmu/supermarket (v. 2014-05-27)},
    howpublished = {Downloaded from \url{https://crawdad.org/cmu/supermarket/20140527}},
    doi = {10.15783/C7MW2Z},
    month = may,
    year = 2014
}

TY  - DATA
TI  - CRAWDAD dataset cmu/supermarket (v. 2014-05-27)
UR  - https://crawdad.org/cmu/supermarket/20140527
PY  - 2014/05/27/
AU  - Aveek Purohit
AU  - Shijia Pan
AU  - Kaifei Chen
AU  - Zheng Sun
AU  - Pei Zhang
DO  - 10.15783/C7MW2Z
ER  -

If you do not use the provided citation formats, please include a reference with the same information, as described in the CRAWDAD FAQ.